workflow: update issue template

Author: ulivz

.github/ISSUE_TEMPLATE/bug_report.md

@@ -24,25 +24,12 @@ about: Create a report to help us improve
 
 <!-- If you are reporting a bug that can ONLY be reproduced on your repository, PLEASE provide this repo link. That takes guessing work out of the way and saves us time. -->
 
-<!-- If your repo isn't public, you can use this boilerplate to create a proper reproduction repo quickly: https://github.com/ulivz/template-vuepress -->
+<!-- If your repo isn't public, you can use `codesandbox` or `yarn create vuepress` to create a minimal reproduction -->
 
 #### What is expected?
 
 #### What is actually happening?
 
 #### Other relevant information
 
-<!-- Please choose one of the following and and fill in the information. -->
-<!-- (Update "[ ]" to "[x]" to check a box) -->
-
-- [ ] My VuePress version is lower and euqal than `1.0.0-alpha.47`:
-
-  - VuePress version:
-  - OS:
-  - Node.js version: 
-  - Browser version: 
-  - Is this a global or local install? 
-  - Which package manager did you use for the install?
-  - Does this issue occur when all plugins are disabled?
-
-- [ ] My VuePress version is higher than `1.0.0-alpha.47`, the following is the output of `npx vuepress info` in my VuePress project:
+- Output of `npx vuepress info` in my VuePress project: